* {
  margin: 0;
  padding: 0;
}
li {
  list-style: none;
}
.focus {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 375px;
  height: 211px;
  background: pink;
  overflow: hidden;
}
ul {
  width: 1000%;
  margin-left: -100%;
}
li {
  float: left;
}
li img {
  width: 375px;
  height: 211px;
}
ol {
  position: absolute;
  right: 10px;
  bottom: 10px;
}
ol li {
  margin: 0 3px;
  width: 10px;
  height: 10px;
  border-radius: 5px;
  background: #fff;
  transition: all 0.5s;
}
.current {
  width: 20px;
}
